Joint for concrete pipe



lA. J. BOYLE.

.lOlNT FOR CGNCRETE PIPE.

APPLlcArloN FILED JULY 23. |919.

Patented July 6s 1.92%).

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WWQMWM PATENT OFFICE.

ALBERT J. BOYLE, OF BALTIMORE, MARYLAND.

JOINT FOR CONCRETE PIPE.

Specification of Letters Patent.

Patented July 6, 1920,

Application filed July 23, 1919. Serial N0. 312,719.

To all whom it may concern:

Be it known that I, ALBERT J. BoYLE, a citizen of the United States,resident of Baltimore, Maryland, have invented certain new and usefulImprovements in Joints for Concrete Pipe, of which the following is aspecification.

My inventionis designed to provide a joint for concrete pipe which willgive aS- surance against 'leakage as this is a very serious objectionwith this class of pipe and has resulted in the loss of millions ofgallons of water per day when used as a water pipe.

My aim is to provide an expansion joint which will absolutely assurefreedom from leakage; be very simple in construction; easily applied andreadily accessible for connection, disconnectionor tightening.

ln the accompanying drawing in igure 1, l have shown a section through apart of two pipe sections, one fitting within the other. Fig. 2 is aview of a modified form.

The ends of the pipe may be of ordinary or any improved construction, Arepresenting what is known as the spigot end, having an overhanging partA and B the bell end and it is between these ends that my ljoint ismade. rl`he top. of the figures represent the inside of the pipe.

l use a cylindrical sheet a of copper or other suitable metal with anoutwardly turned end b` and embed this in the end A of the pipe as it isformed, as concrete will not adhere to copper or smooth metal and it isnecessary to iiX the cylinder in the pipe at the time of manufacture tomake a positive connection.

The cylinderal projects beyondthe end of the part A', preferablycovering the space A3 and this extension is formed or otherwise providedwith a section a which may have one or more corrugations in order to.give the needed expansion.

The end a of the cylinder a has an upturned end a2 and this is securedin lace against the vertical wall C of the end% of the pipe, being heldin place between two angle irons d d which in turn are supported by aseries of boltsle, each having one end embedded or anchored in the endof the pipe B and the other end protruding therefrom, nuts 7" f holdingthe angle irons in place while anannular lead washer or ring gisntilized to make a water and gas tight joint.

I provide ashield o3 to cover the bottom of the corrugatlons a andprevent them being filled in making the joint and if desired l may useanother shield above the corrugations to prevent the space between themfrom being filled and thus interfere with the expansion action.

In Fig. 2 I show a modified form of the cylinder a, in which instead ofthe corrugated section a secured to the cylinder, the cylinder has anintegral extenslon aN2 with two corrugations to provide the necessaryexpansion and a piece of tar paper may be used to prevent the group fromfilling the corru ation.

ln ringing the pipe sections together it is only necessary to connectthe flange a2 in'place to the wall of the pipe section B.

The space shown at A3 is flushed with cement or other suitable materialby pouring in the usual way.

The exposed ends of the pipe sections at the joint opening are paintedwith asphalt or pitch.

In case of a loose connection my design is so perfected as to permit theplacing of the line into operation immediately after lthe joints aretightened up without waiting for cement to harden. V

The space A2 is lled with grout or other material to make the 'ointcomplete, but it will be observed that t is may readily be removedwithout injurin the pipe sections if for any reason it is esired todisconnect the sections or tighten up the parts.

rlhe joint is so flexible as to permit deiiection in the line in case itis desired to turn a reasonable distance to avoid a physical conditionwithout altering the length of the sections of the pipe.

lt is made possible by my improved joint to lay and test the entire lineor an part of it before finally filling the joints. his is a veryimportant advantage.

What l claim is:

l. An expansion joint for concrete pipe comprising a metallic cylinderhaving one end secured in the end of one concrete section and theopposite one secured tothe ad- 'ico expansible corrugat'on intermediateo its length, and means for protecting the folds of the corrugationsfrom the filling, substantially as described.

2. An expansion joint for concrete pipe sections comprising a metalcylinder having one end secured to the end of one of the pipe sectionsand the opposite end flanged and extending at right angles to thecylinder and secured to the face of the adjacent concrete pipe section,said'securing means being detachable and including a packing, saidcylinder being eXpansible at a point intermediate of its length,substantially as'described.

In testimony whereof I affix my signature.

ALBERT J. BOYLE.

